Whole baked red onions | Jamie Oliver recipes

Ingredients

• 4 large red onions, skin on
• olive oil for brushing
• flaky sea salt, to finish
• For the dressing
• 80 g / 2¾ oz walnuts
• 10 sage leaves, rolled up and cut into really thin strips
• 1 tbsp honey
• 2 tbsp white wine vinegar
• 2 tbsp boiling water
• 1 tsp mild chilli flakes
• ½ tsp salt
• a little freshly ground black pepper
• 3 tbsp olive oil
• a few sprigs of mint, leaves picked (about 15 g / ½ oz)